alter table column name code example

Example 1: sql server alter column

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

Example 2: change column name in sql

MySQL:
ALTER TABLE Customer CHANGE Address Addr char(50);

Oracle:
ALTER TABLE Customer RENAME COLUMN Address TO Addr;

Example 3: change column name sql

ALTER TABLE `db_name`.`table_name` 
	CHANGE `current_column_name` `new_column_name` datatype(size) NOT NULL COMMENT '';

Example 4: sql alter column name sql server

EXEC sp_RENAME 'table_name.oldColumn_name' , 'newColumn_name', 'COLUMN'

Example 5: change column name sql

ALTER TABLE users
 ALTER COLUMN first username varchar(20);